Thanks for the bug report. It appears the first gnome-shell instance
(the login screen) has started before the amdgpu kernel driver was
loaded. And when the amdgpu driver appears one second later, gnome-shell
thinks the GPU has been swapped. The compositor (Mutter) clearly does
not handle this well, but it also shouldn't have to. The login screen
should not be started until amdgpu has fully loaded.
The long settling time in this case might be caused by having two AMD
GPUs to initialize.
** Summary changed:
- Ubuntu 25.04 fails to start gnome login shell
+ Login screen starts with simpledrm and switches to amdgpu one second later,
causing freezes
** Package changed: gnome-shell (Ubuntu) => gdm3 (Ubuntu)
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags added: amdgpu hybrid
** Changed in: gdm3 (Ubuntu)
Importance: Undecided => High
** Changed in: systemd (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/2115451
Title:
Login screen starts with simpledrm and switches to amdgpu one second
later, causing freezes
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